Farhad,

It was your assertion that somehow, fatigue loads applied to the jacket would not translate to pipe stress that concerned me. All platforms, just like every other structure, deflect under load. I have been on many 'fixed' platforms in North Sea storm conditions, when it was difficult to stand still due to deck movement caused by waves and wind and have observed very large movements of teflon sliding supports around bridge loops.

Given that piping crossing a bridge from one platform to another will often be production and test headers, from wellhead to process areas and thus very high pressure and stiffness, they will be some of the most critical lines on the plant.